Freetronics Forum

Because the DMD's use spi, can't you just connect the two dmd's in series, and set the arduino to only one panel, the data will flow through the first panel into the next panel, but I think the data will be one line lower on the second panel..

AussieWombat

Sparky NZ, That sounds great. I, myself , wrote a basic program on my Mono Maximite ( a device similar to the arduino, but powered by a pic32 ), that mirrors the vga output, pixel for pixel, to the group of dmd's. I have used the display to have a single space invader move across the screen in real ...

hi Charlest,

For power supplies you could try here
The RS-15-5 is a single rail, 5V 3.0A model for $18

They have a large range with various voltages..

Cheers Dennis

Hi Geoff, I found that if I had all 9 panels connected, and only told the arduino there was 3x1 then all of the panels worked, but obviously the last 6 were just out of sync with the first 3. I was working on two controllers at the same time. The Arduino, and a Maximite Monochrome(pic32) . I just pi...

Hi Stryker, I found a similar issue, some time ago, in this http://forum.freetronics.com/viewtopic.php?f=26&t=3639 thread. The panels were drawing very slowly. 1 pixel per second. I never really resolved it, and just went on with my pic32 variant( works with 4x3 ) 12 panels..and I hope my (7x3) 21 p...

Hi Colandra, I modified John's code slightly, to allow for the button held down, to not continue counting, by setting a flag, once the pin goes low, the flag is reset allowing the count to continue. I also removed the switch--case () commands from the drawNumber routine and replaced it with a digit ...

Hi,

I have 9 panels in a 3x3 layout, and will be going onto 21 panels (3 wide x 7 down) once I sort out the Roving networks RN 42 XV bluetooth drama with appinventor..

Regards Dennis

I use the UDP test tool V3.0 from Simple Comms Tools-UDP Test tool to send data over the local area network and control the text output on the DMD panels. #include <SPI.h> #include <DMD.h> #include <TimerOne.h> #include <SPI.h> #include <Ethernet.h> #include <EthernetUdp.h> //#include "SystemFont5x7...

Cool. I am looking at getting a tri-color panel from china to reverse engineer. Says it is for video, not message, but I will give it a go.. So many panels to choose from.. Get some with 3mm spacing instead of ten mm...

Dennis

Hey, I had to reverse engineer the library to get it to work on the maximite. If it is all too hard, then I am sorry some need it easy. Rather than give you some code to look at , that may be easier to understand, than the DMD library file, then maybe I should just spell it out in laymans terms for ...